NumberResearchThousands-blocks in 731-837
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 731-837 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 731 blocks
Most active assignees, all time — NPA 731
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-07-31 | 731-837-0XXX | 0000–0999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | MIDDLETON | TN |
| 2016-05-23 | 731-837-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | MIDDLETON | TN |
| 2016-05-23 | 731-837-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | MIDDLETON | TN |
| — | 731-837-3XXX | 3000–3999 | Available | MIDDLETON | TN | ||
| 2021-10-01 | 731-837-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | MIDDLETON | TN |
| 2011-04-29 | 731-837-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MIDDLETON | TN |
| — | 731-837-6XXX | 6000–6999 | Available | MIDDLETON | TN | ||
| 2014-04-04 | 731-837-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MIDDLETON | TN |
| 2019-05-09 | 731-837-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | MIDDLETON | TN |
| 2023-05-10 | 731-837-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MIDDLETON | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.